However, lake- or dam-breach floods cease once the upper reservoir is empty.
On the other hand, the path around the upper reservoir was unfenced.
Moreover, the upper reservoir shows some Sr-heterogeneity that indicates small scale compartmentalization.
The upper reservoir is filled with a separate liquid with a small neutron absorption cross-section.
Originally, the upper reservoir had been surrounded by a low iron fence like the one in place now.
This difference in elevation is known as the "water head" and, along with the volume of water stored in the upper reservoir, determines the system's potential energy.
In the LBA case the upper reservoir (the sea) was effectively infinite, and the flood stopped when the lower reservoir (the caldera) filled up to sea level.
Some work is put in here, some heat Q2 is taken from the lower reservoir and the heat Q1 is delivered to the upper reservoir.
The motor drives the pump during the storage portion of the cycle, while the generator produces electricity during discharge from the upper reservoir.
The hydroelectric plant generates electricity during peak times of demand by releasing water from one reservoir into a lower reservoir, then pumping the water back to the upper reservoir.
The hydroelectric station is associated with a pumped storage installation that uses surplus electricity during the night hours to pump water into an upper reservoir, for use in generating electricity during daylight hours of peak demand.
